I purchased this one at Kobo during a recent Open Road Media promotion on true crime titles for $1.99 each (now back to full price, but sometimes they repeat their sale titles and of course it's couponable if you manage to score a really good code in one of the contests):
The Blooding, the story of the discovery of DNA identification in England and its use in solving the Narborough village murders, by Joseph Wambaugh (
Wikipedia), who writes it in the style of one of his police procedural novels.
Disclaimer: I have not gotten around to reading it yet, but it's said to be very good and garnered a lot of review praise (blurbed on the ORM product page) when it first came out in 1989.
(ETA: still lingering at $1.76 for Canadians in the
Amazon store, may have comparable pricing for US persons)